Atlanta has an odorific problem with people urinating in the elevators used in the city train stations. Some people describe the smell of the elevators as akin to a Porta-John that you might see at an outdoor concert.

"The smell hits you so bad. You hold your breath just to hurry up and get off the elevator," said Alicia Porter, a rider on a Metropolitan Atlanta Rapid Transit Authority (MARTA) train.

To help stop people from urinating in the elevators, MARTA has installed a urine detection system in the elevators. That system includes sensors that are able to detect urine and a camera to catch the offender literally with their pants down.

The sensors alert MARTA police who are able to respond immediately and catch the offender in the act. The transit system currently has 111 elevators, and one offender has already been caught.

While the efforts to catch habitual urinators are admirable, the system doesn’t come cheap. The urine detection system reportedly costs about $10,000 per elevator.